Mutsu Province

Mutsu Province, also known as Oshu, was an ancient province of Japan located in present-day Iwate Prefecture, Aomori Prefecture, and Miyagi Prefecture in northern Honshu.

History
Mutsu was divided between the Iwate Prefecture to the north and the Miyagi Prefecture to the south, ruled by the Date and Hatakeyama, respectively. The province was unified in 1547 when Yoshinori Date seized Miyagi from the Hatakeyama clan. The province later became Masamune Date's territory, and it was subjugated by the Toyotomi by 1590. That year, Masamune led the Kasai-Osaki Uprising against Hideyoshi Toyotomi in hopes of taking back his province, but it was crushed. The region was one of those loyal to the Eastern Army during the Sekigahara Campaign of 1600, and as a reward, Ieyasu Tokugawa granted the province to the Sendai Domain, which remained in power until the Boshin War of 1868, which ended the samurai and the provinces of Japan.